import os
import sys
import re
import unittest
from cli.meta.applications import find_application_ids

# ensure project root is on PYTHONPATH so we can import the CLI code
# project root is two levels up from this file (tests/integration -> project root)
ROOT = os.path.abspath(os.path.join(os.path.dirname(__file__), os.pardir, os.pardir))
sys.path.insert(0, ROOT)

class TestValidApplicationUsage(unittest.TestCase):
    """
    Integration test to ensure that only valid application IDs
    are used in all .yml, .yaml, .yml.j2, .yaml.j2, and .py files.
    Methods like applications.items() and calls to get_domain() can
    be whitelisted or validated against valid IDs.
    """
    # regex patterns to capture applications['name'], applications.get('name'), applications.name, and get_domain('name')
    APPLICATION_SUBSCRIPT_RE = re.compile(r"applications\[['\"](?P<name>[^'\"]+)['\"]\]")
    APPLICATION_GET_RE      = re.compile(r"applications\.get\(\s*['\"](?P<name>[^'\"]+)['\"]")
    APPLICATION_ATTR_RE     = re.compile(r"applications\.(?P<name>[A-Za-z_]\w*)")
    APPLICATION_DOMAIN_RE   = re.compile(r"get_domain\(\s*['\"](?P<name>[^'\"]+)['\"]\s*\)")

    # methods and exceptions that should not be validated as application IDs
    WHITELIST = {'items', 'yml', 'get'}

    def test_application_references_use_valid_ids(self):
        valid_apps = find_application_ids()

        tests_dir = os.path.join(ROOT, 'tests')
        for dirpath, _, filenames in os.walk(ROOT):
            # skip the tests/ directory and all its subdirectories
            if dirpath == tests_dir or dirpath.startswith(tests_dir + os.sep):
                continue

            for filename in filenames:
                if not filename.lower().endswith(('.yml', '.yaml', '.yml.j2', '.yaml.j2', '.py')):
                    continue
                filepath = os.path.join(dirpath, filename)
                try:
                    with open(filepath, 'r', encoding='utf-8') as f:
                        content = f.read()
                except Exception:
                    # skip files that cannot be opened
                    continue

                for pattern in (
                    self.APPLICATION_SUBSCRIPT_RE,
                    self.APPLICATION_GET_RE,
                    self.APPLICATION_ATTR_RE,
                    self.APPLICATION_DOMAIN_RE,
                ):
                    for match in pattern.finditer(content):
                        name = match.group('name')
                        # skip whitelisted methods/exceptions
                        if name in self.WHITELIST:
                            continue
                        # each found reference must be in valid_apps
                        self.assertIn(
                            name,
                            valid_apps,
                            msg=(
                                f"{filepath}: reference to application '{name}' "
                                f"is invalid. Known IDs: {sorted(valid_apps)}"
                            )
                        )

if __name__ == '__main__':
    unittest.main()